25403787890 has 32 divisors (see below), whose sum is σ = 49341141360. Its totient is φ = 9361407744.

The previous prime is 25403787869. The next prime is 25403787917. The reversal of 25403787890 is 9878730452.

It can be written as a sum of positive squares in 8 ways, for example, as 2976029809 + 22427758081 = 54553^2 + 149759^2 .

It is a super-2 number, since 2×25403787890² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125789 + ... + 258128.

Almost surely, 2^25403787890 is an apocalyptic number.

25403787890 is a deficient number, since it is larger than the sum of its proper divisors (23937353470).

25403787890 is a wasteful number, since it uses less digits than its factorization.

25403787890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384446.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 25403787890 in words is "twenty-five billion, four hundred three million, seven hundred eighty-seven thousand, eight hundred ninety".